Thanks for the mention - just checked and he said it was not a fix it ticket - rather the full $491 carpool violation, unf.
That's what I've heard too.
I actually had a friend who crossed the double-white-lines for the express lane on a weekend. The cop wrote him up for the full $491 ticket. Technically, regardless of whether or not the HOV restrictions are active, you may never ever cross the double white lines 24/7/365.
Most cops won't be pricks. But I am not relying on a cop's good mood and compassionate attitude towards motorists to protect me from $500 tickets. You are more than welcome to